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Intangible Asset - Summary of Intangible Assets (Detail) - USD ($)
$ in Thousands
Apr. 28, 2019
Apr. 29, 2018
Apr. 30, 2017
May 01, 2016
Intangible Assets [Line Items]        
Tradenames $ 7,232 $ 683    
Intangible assets 10,448 4,275    
Customer Relationships [Member]        
Intangible Assets [Line Items]        
Finite-lived intangible assets, net 2,538 2,839 $ 664 $ 715
Non-Compete Agreement [Member]        
Intangible Assets [Line Items]        
Finite-lived intangible assets, net $ 678 $ 753 $ 828 $ 903